Grammar Checker

What this grammar checker actually catches

This tool runs your text through a set of pattern-based checks for the mistakes that show up most often in everyday writing: commonly confused word pairs (their/there, your/you're, would of/would have), doubled words, missing spaces after punctuation, repeated punctuation marks, sentences that don't start with a capital letter, and sentences that have grown long enough to hurt readability. Everything runs in your browser - nothing you type is sent anywhere.

Why it's scoped to pattern-matching, not full grammar parsing

It's intentionally built around mechanical, pattern-matchable issues rather than full sentence-level grammar analysis - subject-verb agreement across complex clauses, tense consistency across a whole passage, or deeper style judgment all require genuine linguistic parsing that a pattern-matching tool like this one doesn't attempt. For that level of checking, you still need either a careful human read-through or a full NLP-based grammar engine.

The specific checks it runs

Beyond the confused-word patterns, it flags doubled words ("the the"), double spaces, repeated punctuation marks like multiple exclamation points, a missing space right after a comma or period, sentences that start with a lowercase letter, sentences running past roughly 40 words, and passive-voice constructions (a "to be" verb followed by a past participle, like "was written" or "is made"). The long-sentence and passive-voice flags are both style suggestions rather than hard grammar rules - neither is technically wrong, they're just worth a second look.

A genuinely private first pass

Because every check runs as JavaScript directly in your browser, nothing you paste in is ever transmitted to a server - useful when checking drafts you aren't ready to share, or simply when you want an instant result with zero wait and zero account required.

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Does this catch every grammar mistake?

No - it is built to flag common, pattern-matchable mistakes (confused words, typos, spacing, repeated words, overlong sentences) rather than perform full linguistic parsing. It is a useful first pass, not a substitute for proofreading.

Is my text uploaded anywhere?

No - the check runs entirely in your browser with JavaScript. Nothing you type is sent to a server.

Why did it flag a sentence that looks fine to me?

Some checks (like the long-sentence warning) are style suggestions rather than hard rules. A 45-word sentence is not wrong - it is just worth a second look for readability.

Can this catch subject-verb agreement errors like "they was"?

Not reliably for complex sentences - this checker is pattern-based rather than a full grammar parser, so it focuses on common confused-word pairs, typos, and spacing rather than deep grammatical analysis across varied sentence structures.

Why does it flag "would of" but not every incorrect word usage?

The checker's confused-word list covers specific, well-known mistakes that are almost always errors rather than style choices (like "would of" for "would have") - it's deliberately limited to patterns that are reliable enough not to produce excessive false flags.

Is passive voice actually a mistake?

No - passive voice is grammatically correct and sometimes the better choice (for example, when the actor is unknown or unimportant). It's flagged only as a style suggestion, since active voice is often more direct, not because passive voice is wrong.

Does this tool have a tone detector or writing-style score like some other grammar checkers?

No - genuine tone detection needs real natural-language-processing models, not pattern matching, so adding one here without that would mean either a fake result or an expensive API behind a "free" tool. This checker stays honest about what pattern-matching can and can't do.